There is a five second activity duration to account for the serial transfer of data to the printer.

需要用五秒钟的活动持续时间来安排到打印机有序传输数据。

youdao

Connect printer to the serial port (back panel) using the supplied cable and turn it on.

连接打印机的串行端口(背板)使用提供的电缆和打开它。

youdao

Electronic torque Tester. Controlling of min - and maximum torque values with LED and LCD-display. Internal memory for 2000 values, interface for PC or serial printer.

用发光二极管显示器或者液晶显示器控制其最小和最大扭矩值。内部存储器中可储存多达2000个测量数值，具有个人计算机或者串接打印机的借口。

youdao

An Epson ink-jet printer's connector fit, but 3Com's marketers don't mention that Bluetooth behaves like a serial port rather than a parallel one, making installation difficult and keeping many printers from reporting things like the status of ink cartridges or paper jams.

FORBES: Magazine Article